Outboxing and outfighting Pavlik at 160 was very impressive, he's the only one to beat him at MW. His first fight with Williams, he only took on short notice and lost a very close and debatable decision. The rematch, he annihilated Williams in a way nobody had done. Say what you want about Chavez Jr., but he beats more than a few top 10 MW based on his size, strength, and determination. Martinez not only wins, but he mystifies opponents with his unusual blend of movement and power punching. Dude ducks no one. He deserves his place in P4P rankings.

He hasn't beaten any of the 'real' top 7-8 guys, out of Junior, who is a fraud. Just check it out from boxrec if you don't believe me. He hasn't fought Geale, Quillin, Golovkin, Sturm, Pirog. Yet he is calling out the smaller money-stars such as Mayweather, like he would all of a sudden somehow deserve that fight after beating Junior. No offence to the fans of these guys: Williams, Pavlik, Macklin, but they are not that good fighters.

Let's start from early in his career to answer your question. I will do it in bullet points so as to make it easy for you understand.

>Martinez started boxing when he was 20 years.
>Whilst he was winning world titles he was also working 2, sometimes 3 other jobs.
>His only real loss came to Margarito 12 years ago. He hasn't really lost since. Most of his early wins came whilst working at least 4 other jobs.
>He dominated Kermit Cintron at 154 and TKO him but the fight was resumed after a 10 minute break because he claimed it was a head butt.
>He knocked out cold one of the most avoided fighters in the history of boxing, Paul Williams. Williams had never been knocked out before. He had also honestly won the first fight.
>He disfigured Kelly Pavlik's face. Made him look average at best.
>He knocked down Dzinziruk 5 times in 8 rounds. Dzinziruk had never been knocked down or knocked out before. As Jim Lampley stated "It is impossible to look good against Dzinziruk. Martinez looked sensational."
>Darren Barker had never lost before. Martinez knocked him out.
>Dominated/Schooled Chavez Jr who was without a doubt 25+ pounds heavier than him on fight night. Technically a Cruiserweight. That is the equivalent of Mayweather fighting an Andre Ward if not heavier fighter.
>Got knocked down by this guy who was 25+ pounds heavier and came back punching. Not clinching, but punching.